In a reflector antenna[?], the relative reduction in the effective aperture of the antenna caused by the masking effect of other antenna parts, such as a feed horn or a secondary reflector, which parts obstruct the radiation path.
... mi²). 3.5 km² (1.4 mi²) of it is land and none of the area is covered with water.
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As of the census of 2000, there are 5,013 people, 1,455 ...